Re: [biofuel] Re: Biodiesel for heating - viscosity
Sorry to appear rude, actually, sometimes tone of voice is hard to control in this medium. Anyway, your method of determining viscosity is looking good. Can you give me some idea of viscosity of dino-fuel at particular temperatures. I assume this is temperature dependent. Can dino-oil be used as a standard and biodiesel viscosity be estimated based on time ratios at a particular temperature? What are we looking for as to the acceptable limits? Is there some correspondence between specific gravity, which is simple to measure, and viscosity? If these answers are not all available at this time, how about we set up the questions and try to get answers over the next few weeks and compare notes. Thanks! In a message dated 11/6/01 1:20:46 AM, [EMAIL PROTECTED] writes: --- In [EMAIL PROTECTED], [EMAIL PROTECTED] wrote: And just how am I to measure out ~5 centistokes? What are centistrokes anyway, a bug disease? Hey no need to be rude, man! You asked the question, here are the answers. Kinematic viscosity is measured in Stokes. You can not measure it at home without a viscosimetre. There is a comparative way, though. Take a liquid with a known viscosity value (dino heating oil, look the value up in a engineering manual) and let a known volume flow through an upsidedown plastic water bottle with a drinking straw glued in a hole in the screw top. Stop the time with a stopwatch. Do the same with your biodiesel (same volume) and compare the results. Generally a smaller diameter straw will produce more accurate results. If the time of your sample is 1.5 the time of your control sample (dino) this means its viscosity is roughly 1.6ish that of the control sample. Cheers, Aleks Yahoo! Groups Sponsor -~-- Universal Inkjet Refill Kit $29.95 Refill any ink cartridge for less! Includes black and color ink. http://us.click.yahoo.com/E11sED/MkNDAA/ySSFAA/FGYolB/TM -~- Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html Please do NOT send unsubscribe messages to the list address. To unsubscribe, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
[biofuel] Re: Biodiesel for heating - viscosity
snip Can you give me some idea of viscosity of dino-fuel at particular temperatures. Yeah. Viscosity is measured at 20 degC for biodiesel, because with heat it's viscosity falls close to that of dino. Dino's viscosity changes very little with temperature - compared to biodiesel. I assume this is temperature dependent. Can dino-oil be used as a standard and biodiesel viscosity be estimated based on time ratios at a particular temperature? What are we looking for as to the acceptable limits? Dino is between 1.5 and 3.5 centistokes @ 20 degC - correct me if I'm wrong, fellas - unachievable with bio due to it's chemical properties. So 4 cSt would be exceptionally good, 5-6 acceptable, 7-8 not quite good and 8 cSt would be bad. But that's just my 0.02$. Is there some correspondence between specific gravity, which is simple to measure, and viscosity? Not really. I've seen bio with a Sg 0.885 g/l (excellent) and have a kinematic viscosity of 10.5 cSt (horrible) but an acceptable cetane number of ~50! Have someone from the list post a link to the DIN 51606 standard, there is all you need to know what good bio should be like (I don't have the link). snip Cheers, Aleks Cheers, Aleks Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html Please do NOT send unsubscribe messages to the list address. To unsubscribe, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
[biofuel] Re: Biodiesel for heating - viscosity
--- In [EMAIL PROTECTED], Aleksander lt;kac [EMAIL PROTECTED] wrote: snip Can you give me some idea of viscosity of dino-fuel at particular temperatures. Yeah. Viscosity is measured at 20 degC for biodiesel, because with heat it's viscosity falls close to that of dino. Dino's viscosity changes very little with temperature - compared to biodiesel. I believe Joshua Tickells book Fryer to the Fuel Tank has a chart of Viscosity/Temperature for bio and dino diesel. Bd doesn't approach dd till 50 degrees C. Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html Please do NOT send unsubscribe messages to the list address. To unsubscribe, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
[biofuel] Re: Biodiesel for heating - viscosity
--- In [EMAIL PROTECTED], [EMAIL PROTECTED] wrote: And just how am I to measure out ~5 centistokes? What are centistrokes anyway, a bug disease? Hey no need to be rude, man! You asked the question, here are the answers. Kinematic viscosity is measured in Stokes. You can not measure it at home without a viscosimetre. There is a comparative way, though. Take a liquid with a known viscosity value (dino heating oil, look the value up in a engineering manual) and let a known volume flow through an upsidedown plastic water bottle with a drinking straw glued in a hole in the screw top. Stop the time with a stopwatch. Do the same with your biodiesel (same volume) and compare the results. Generally a smaller diameter straw will produce more accurate results. If the time of your sample is 1.5 the time of your control sample (dino) this means its viscosity is roughly 1.6ish that of the control sample. Cheers, Aleks Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html Please do NOT send unsubscribe messages to the list address. To unsubscribe, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
